Voltage, Regulator, Coil, Ballast, MP Electornic Ignition, Standards.

Ckeaning wire terminals is a valiant effort and often helps.
Consider this... The portion that can be cleaned might be the size of your pinky nail.
The smaller crimp barrel portion of the terminal that is critical to conduction remains unchanged.
It takes a very long time for moisture to get in and contaminate those smaller spaces. 40+ yrs is a very long time.
Renew requires snip, strip, crimp.
Beyond that, a cleaning flux with the consistancy of water and silver bearing solder, and a silicone moisture barrier ( might be overkill ) is better than renew the OEM.
Yeah I did all of that to my 67 along with a few new larger than OEM awg wires.
I must be krazy.